GRID-CORRECTION CIRCUIT FOR TV SETS

摘要

It is known to supply a test signal periodically to the deflector circuit, to compare the test deflection current (iT) flowing in the deflector circuit with a reference value (Uref) in a comparator (7) and to use the resultant signal (Us2) to change the test deflection current (iT) and the grid deflection current (iA) stepwise. The aim is to prevent the grid deflection current from oscillating about the reference value. The test procedure with the oscillating procedure is carried out only for an imperceptible time during the picture, and the grid deflection current (iA) is corrected only if the test deflection current (iT) deviates from the reference value (Uref) by more than one step. In particular for a projection TV set.